Velocity time graph work sheet what was the greatest velocity

Two wheels have the same mass and radius of 4.4 kg and 0.48 m, respectively. One has (a) the shape of a hoop and the other (b) t

abruzzese [7]

Answer:

1) $\sum T_{externalhoop}=0.4418Nm$

2) $\sum T_{externaldisc}=0.2209Nm$

Explanation:

Using the second equation of angular motion we have

$\theta =\omega _{o}t+\frac{1}{2}\alpha t^{2}$

Since the wheels start from rest we ahve $omega _{o}=0$

Applying the given values in the equation we have

$14=\frac{1}{2}\alpha \times 8^{2}\\\\\therefore \alpha =\frac{28}{64}=0.4375rad/s^{2}$

Now by newton's second law of motion in angular motion we have

$\sum T_{external}=I\alpha$

1) For Hoop We have

$I_{hoop}=Mr^{2}\\\\\therefore I_{hoop}=4.4\times(0.48)^{2}=1.01376kgm^{2}$

Thus

$\sum T_{external}=1.01376\times 0.4375$

$\sum T_{external}=0.4418Nm$

2)For disc We have

$I_{disc}=\frac{Mr^{2}}{2}\\\\\therefore I_{hoop}=2.2\times(0.48)^{2}=0.506kgm^{2}$

Thus

$\sum T_{external}=0.506\times 0.4375$

$\sum T_{external}=0.2209Nm$

5 0

4 years ago

What is the difference between the number of electrons in an atom of selenium,se, and the number of electrons in an atom of alum

Daniel [21]

Selenium has 36 electrons34(atomic number) + 2(amount of electrons gained in the ion, has a 2- charge) = 36
To identify the number of electrons an element has, all you need is a periodic table. Identify the atomic number (the smallest of the 2 numbers in the box). That number will be the number of protons which is also the number of electrons.
*number Atoms of all elements are made up of three primary particles: protons, neutrons, and electrons. The "sub-atomic" particles each have specific properties that such as size, electrical charge, etc. that are crucial for the stability of the atom. The particles break down like this: Particle Relative size Charge Location How to determine

Proton 1 + in the nucleus # of protons= element's atomic # (use periodic table)

Electron 0 - outside nucleus # of electrons=# of protons(in neutral, "normal" atom)

Neutron 1 0 in the nucleus Must be told or given (ie. can vary--isotopes--

for small elements most common form often

consists of isotope where #protons=#neutrons) Aluminum has 13 electrons because it needs 13 negative charges to balance the 13 postively-charged protons (which is what the periodic table told us it contains). This will make the Aluminum atom electrically neutral.

5 0

3 years ago

A 2.7-kg ball is thrown upward with an initial speed of 20.0 m/s from the edge of a 45.0-m-high cliff. At the instant the ball i

sveticcg [70]

Answer:

a) 72.54° and It will take the woman 33.4m

Explanation:

The woman runs with a constant speed V1 = 6m/s

V2 = 20m/s

V1 = V2 cos θ

Cos θ= V1/V2= 6/20

Cos θ= 0.3

Cos^-1 0.3=72.54°

Using Range formular for projectile

R= (V2 Cos θ)/g (V2 Sin θ)^2 +sqrt(V2 Sin θ)^2 + 2gh)

R= (20cos72.54)(2Sin72.54+sqrt(20Sin72.54)^2 + 2×9.8×45

R=33.4m

b )

see the attached file

7 0

3 years ago

The line models the cost of renting a bike. It costs $3 per hour plus a $4 deposit. Write an equation in slope-intercept form

skad [1K]

Answer:

y=($3/1h)x+$4, it costs $19 to rent the bike for 5 hours.

Explanation:

An equation in slope-intercept form is y=m*x+n. In this case y would be the cost of rent, while x is the time. We need to determine m and n.

At the very beginning, x=0h (h is hours), the cost of rent is the deposit, so we know that $4=m*0h+n=n. Then we know that the cost of rent must increase by $3 with each hour, which means that the slope is m=$3/1h. Another way of getting this value would be to think on a particular case: after 1 hour, the cost of rent should be the deposit plus an hour of rent, or $7, so it should happen that $7=m*1h+$4 (where the $4 we already know is the value of n, and the numbers in italics are the values for the particular case we are looking for), from where we get that m*1h=$3, so m=$3/1h (the same result as before).

Putting all together, we have y=($3/1h)x+$4, and for 5 hours we get y=($3/1h)(5h)+$4

4 0

4 years ago

18

zhannawk [14.2K]

Average speed= total distance/total time =12km/h

6 0

3 years ago